Cells are regarded as the basic unit of structure and function in living organisms.
Cells are regarded as the basic unit of structure and function in living organisms. They exercise our body’s basic functionalities. A cluster of these specialized cells together acts to shape a tissue. Plants and animals have tissues distinct from one another. There are four types of tissues in animals namely:
The primary tissue of our nervous system is the nervous or nerve tissue. It monitors and controls the body’s functions. Nervous tissue consists of two cells: neurons or nerve cells and glial cells, which helps to transmit nerve impulses and also provides nutrients to neurons.
Information in the neuron is unidirectional as it passes from dendrites through the neurons, down the axon through the cell body.
The nerve tissue or nervous tissue is the chief component of the two major parts of the nervous tissue – the central nervous system (CNS) formed by the spinal cord and the brain, and the peripheral branching nerves of the peripheral nervous system (PNS) that control and regulate the body’s functions and activities. The nervous tissue is located throughout the body in the peripheral nerves as well as in the central nervous system organs such as the spinal cord and brain.
The signals generated and initiated in the CNS (central nervous system) typically from the brain and in some cases, the spinal cord, approach the outer edge of sites, such as the internal organs or limbs that are conducting the specified organ of interest in order to take appropriate action. The functioning of the nerves is accomplished by channelling electrochemical signals or impulses from the other nerves or brain or tissues or organs at which the nerves end up. Nerves can be classified into the following, based on functionality:
Motor neurons or motor nerves are capable of transmitting signals or impulses to all the muscles of the body from the spinal cord to the brain. The impulse allows for basic activities such as speaking, walking, drinking water, blinking eyes, sitting, sleeping, etc. Motor neuron damage can cause muscle weakness or muscle shrinkage. The nerve that goes from the bottom up to the buttocks is known as the sciatic nerve. The sciatic nerve allows the whole leg which is a collection of different nerves. Some of those motor nerves work in the hamstrings, feet, thighs, and feet.
The sensory nerves or sensory neurons are responsible, in contrasting directions, for generating impulses or signals from another type of nerves known as motor neurons. The neurons of the senses gather information from the sensors present in the muscles, skin, and other internal organs such as pressure, pain, temperature, etc. which in turn redirect it back to the brain and spinal cord. Such sensory nerves have the ability to transmit information relevant to the movement (except for the pupils, as they do so themselves). Damage to the sensory nerves may cause numbness, discomfort, tingling sensation, and hypersensitivity.
The network of autonomic nerves regulates the actions of the heart muscles, including smooth muscles that are found in the stomach and interlinking glands and other organs. The autonomic nerves regulate the non-controlled, i.e. unconscious functions.
On the lower side of the brain, there are 12 pairs of cranial nerves developing. The cranial nerves identified from forehead to back are listed below:
Nerves with hypoglossal cranial nerves are crucial in smell, vision, movement of the face and eyes, movements of the tongue and salivation.
Nervous tissue is the term for groups of organized cells in the nervous system, which is the organ system that controls the movements of the body, sends and transmits signals to and from different parts of the body, and plays a role in controlling the functions of the body, such as digestion. Nervous tissue is divided into two main categories: neuron and neuron. Neurons or nerves transmit electrical signals while neuroglia does not; neuroglia has many other functions, including neuron support and defence.
Nervous tissue has the fundamental properties of living tissue, is particularly irritable and highly specialized in receiving and transmitting internal as well as external stimuli. The nervous tissue is known as a neuron. The basic unit of the structure of the nervous tissue is the neuron, consisting of a nerve cell body and several processes: dendrites, which carry impulses towards the nerve cell body, and axons, which carry impulses away from the cell body. It has three pieces to it:
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